Pentachlorobenzaldehyde.



UNITED STATES PATENT OFFICE.

MAX WEILER, or ELBnriFELD, GERMANY, ASSIGNOR To FARBENFABRKEN vomvr.

FRIEDR. BAYER & 00., OF ELBERFELD, GERMANY, A CORPORATION OF GEEMANY.

PENTACHLOROBENZALDEHYDE.

No Drawing.

To all whom it may concern:

Be it known that I, MAX VVEILER, doctor of philosophy, chemist, citizenof the German Empire, residing at Elberfeld, Germany, have invented newand useful Improvements in Ientachlorobenzaldehyde, of which thefollowing is a specification.

Lhave found that pentachlorobenzalchlorid (obtainable either by treatingbenzyl chlorid with chlorin or by treating pentachlorotohlene orpcntachlorobenzyl chlorid with chlorintcan be converted into thehitherto unknown pentachlorobenzaldehyde concentrated or fuming sulfuricacid.

In order to illustrate the new process more Specification of LettersPatent. Patented J uly' 18, 1911. Application filed April 11, 1911.Serial N0. 620,427.

I fully the following example is given, the

parts being by weightl:A mixture of 10 parts of pentachlorobenzalchloridwith 50 parts of concentrated sulfuric acid is stirred at about 00-100C. until the evolution of hydrochloric acid ceases. The aldehyde isobtained in a pure state by pouring the mass of the reaction on ice. Itis a white powder ,casily soluble in benzene but not so easily solublein alcohol. It crystallizes in long needles melting at 197199 C.

I claim The herein described pentachlorobenzaldehydc being a whitepowder easily soluble in benzene and melting at l97199 (1.,substantially as described.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses. v MAX WEILER. 1,. s.]

Witnesses:

ALFRED HENKEL, E. Voss.

